Grinding-machine.



I. MFTHOMPSON. GRINDING MACHINE.

APPLICATION FILED JAN.25,1909.

994,216, Patented June 6, 1911.

WITNESSES.

UNITED STATES igrE T OFFICE. I

JAMES THOMPSON, 0F MILWAUKEE, WISCONSIN.

enrnnrne-macnrun.

Application med January a5, 1909. Serial 1%. 474,000.

ner to, revent; vibration, but capable of be- 7 ing rotjatably adjusted "about a central sup-. 1 port to facilitate the application oftools to .the' grinding wheel. I a 3 A further object of my invention is to provide an improved adjustable tool rest, 2 also balanced 'or substantially balanced upon the grindingwheel frame with-toolholders "at eachendi q the following description, reference is f hadii'to} the'p'accompanying drawings, in- "'w i h- I Figure 1 is a view of a grinding machine embodying my invention as seen, from the inner side Fig. 2 is a detail sectional View,

- drawn on line a: of Fig. 1, and looking toward the grinding 'wheel. I i

'ke parts are identified by'the same reference characters in both views.

A supporting member A is provided with clamping arms B and a clamping set screw O, whereby the device may be secured to a table or other suitable support. A casing is provided "witha depending ear D-which is pifvotally secured to'the supporting member by a bolt E, which, when loosened, permit-s the casing to swing pivotally on said bolt to-the .positibn indicated in dotted lines, the ear D being sufficiently offset: laterally to permit this movement. Thecasing is.pro-. vided-with acylindrical chambered portion G, having a removablev side wall F, and a tubular portion H jextendingatangentially therefrom, and vthe ear D is prefefa'bly ;'lo-- cated in the angle formedby the ortions G.

e and H; A worm wheel I is jmo'un ed upon a shaft J in the portion G of the casing, and

the shaft extends through the casing'wall at one side and is .providedwithr-ia Cr {claim as new, and deslr'e to. secure by Let- 1 The worm wheel I mesheswith and drives a a worm shaftL -which is mounted'iu the-i11 either the periphery or. the flat surface .of

Lpl'eting the grinding bularportion H and projects throil lgh'the a t eye d he SQPPQFiiP :th T

projecting end carrying a grinding wheel M.

This worm'shaft L is provided with a collar N, between-which, and a shoulderO formed in the wall ofthe tubular portion- Hm series of balls P are "mounted to receive the end thrust. A single-ball'Q, is interposed between' the rear end of the worm-shaft and a set screw R, which is'screwed into'the end of the portion'Hof the casing," A tool rest frame S is provided with an eye T' encircling the tubular portion H ofthe casirig'nearthe Specification of Letters Patent. Patented J 111166, 1911. i

grinding' wheel, and adjustably securedthei'eto by a set screw U. This frame extends transversely of and below the shaft L and across the face of the grinding wheel and is provided ,with open ended slots V, V,

to facilitate the application of tool rests of.

diff rent character.

v is a flat plate or chisel rest provided with a' member W". near one "lower corner which is provided with a curved slot X' and issecured to the frame by a clamping bolt X, which'passes thr'ough the slots V-and- X. A knife rest Y, is provided, with a similar member Y having a curved slot Z through which, and the slot V", a clamping bolt Z- passes. The chisel rest extends upwardly substantially at a tangent to the surfaceof' the grinding wheel, while the knife rest is supported in a position extendingalong one side of the grinding wheel. "1

In referring to :the' casingas balancedweight of the grinding wheel and its gyrotends vto counteract the operating pressure upon the crank, the machine having. very little vibration and almost none ofthe tendfl ency to work loose so common 'in clamped grindingmachines. v 1

The grind'n'g wheel M is preferably provided with anouter facing m of finer material than that composing the body of the the periphery of the wheel so that it will not cause an uneven wear at the periphery.

T he tool is applied to this facing when com-'- operation if a Y smooth sharp edge desired. I

bed my. invention what upon the support A, I donotm'ean that the parts are exactly balanced in weight, butthat the parts-are so proportioned that the sco-pic stability when rapidly revolving, v

'wheel, and this facing. terminates within ,the worm wheel and the grinding wheel.

2. In a machine of the described class, the combination with a grinding wheel shaft and grinding'wheel, of a transverse driving crank shaft, gear connections between the crank shaft and grinding wheel shaft, 'and a pivotal support ofiset laterally from both shafts. p

3. In a machine of the described class,

the combination with a grinding wheel. shaft and grinding wheel, of a supporting" casing, driving gear mechanism in said casing, anexteriorly projecting driving shaft, and a supporting clamping member provided with a clamping bolt pivotally connecting said member with the casing at a point ofi'setlaterally from both shafts.

4. In a machine of the described class, the combination with a grinding wheel and a grinding wheel shaft provided with a worm Mam thread, of a worm wheel and transverse the shaft, a set screw in said casing alinedwith the shaft, a ball interposed between the set screw and shaft, e collar on the shaft, and a set of balls interposed between said collar and one wall of the casing.

5. In a machine of the described class, the combination with a grindingwheel and a grinding wheel shaft provided with a worm thread, of a worm wheel and transverse crank shaft for driving said shaft, a casing inclosing the worm wheel and a portion of the shaft, a set screw in said casing a-lined with the shaft, ataninterposed between the set screw and'shaft, a collar on the shaft.q

and a set of balls interposed between said collar and one wall of the casing, and a support adjustably connected with the casing at a point offset from both of said shafts.

In testimony whereof I afiix my signature in the presence'of two witnesses.

JAMES M. THOMPSON.

Witnesses:

O. R. ERWIN, LEVERETT C. WHEELER. 

